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INCOME TAXES - Operating Loss Carryforwards, Summary of Deferred Taxes and Temporary Tax Differences (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Noncurrent deferred income tax assets: |  |
Net operating loss carryforwards | $ 79,966 | $ 81,221
Intangible assets | 19,021 | 22,886
Accrual and reserves | 5,201 | 5,919
Other | 52 | 75
Total noncurrent deferred tax assets | 104,240 | 110,101
Valuation allowance | (103,623) | (109,336)
Noncurrent deferred tax assets, net of valuation allowance | 617 | 765
Noncurrent deferred income tax liabilities: |  |
Fixed assets | (617) | (765)
Total noncurrent deferred tax liabilities | (617) | (765)
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance at the beginning of the period | (109,336) |
Gross decrease for current year activity | 5,713 | (9,568)
Valuation allowance at the end of the period | (103,623) | $ (109,336)
Federal |  |
Operating loss carryforwards |  |
Net operating loss carryforwards | 210,775 |
State |  |
Operating loss carryforwards |  |
Net operating loss carryforwards | $ 210,775 |

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